Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and openness are covered. The description adds the return shape (titles, links, descriptions), which is useful, but says nothing about ranking, pagination, or empty-result behavior beyond what the schema and output schema provide.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence with no filler; the verb, resource, scope, and return fields all arrive in one pass and every clause earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema present, return values need not be explained, and the annotations cover the safety profile, so the description is nearly sufficient for this simple two-parameter search. It could be slightly more complete by noting the default/max result count or the read-only nature, but nothing essential for correct invocation is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, with both q (2-100 chars) and limit (1-10, default 5) fully documented in the schema. The description adds no syntax, matching, or query-format guidance beyond the schema, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (Search) and resource (UpGrow blog posts) plus the topical scope (Instagram growth) and the fields returned (titles, links, descriptions). It is clearly distinct from all siblings (facts, signup link, free tools, plans, products), though it never explicitly contrasts with them.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied — 'Search UpGrow blog posts' tells the agent this is for finding blog content, but there is no statement of when to prefer it over the sibling tools or any prerequisite/preclusion. An agent can infer the context but is given no routing rule.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.